Brinyte DIV02 diving flashlight utilize the CREE XM-L2 LED, max 1050 lumens output; powered by 3*AA dry battery, 2 hours run time in high output. Twist on/off switch at head, very easy for you to operate, rated to the depth underwater 50 meters and 12 degree beam angle. The crust is designed according to the ergonomic human engineering.